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An old Nokia mobile with DCT-3 firmware (for network monitor mode) is required. The phone needs to be connected to a computer via its FBUS serial interface, so some level conversion hardware is also required. Since most modern laptops do not have an external serial port, an RS-232 to USB converter is also a good idea.

The last time I visited Wairunga in New Zealand I set about developing two control systems to aid in the running of the farm:

• A voice-controlled sheep press

• An infra-red sensor controlled sheep dip